Control of Laser Speckle Noise Using Liquid Crystals
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概要
- 論文の詳細を見る
Laser speckle noise occurs owing to the strong interference that originates in the high coherency of laser light and the surface topography of the screen. The suppression of the speckle noise is necessary for laser displays such as in an image projection system. In order to reduce speckle noise, we try to control the speckle pattern by using liquid crystals that have electrically controllable optical characteristics. The modulation of polarized light using the birefringence of liquid crystals is very effective. However, the ratio of noise reduction does not exceed 30%. This is because the polarized light transmitted through the liquid crystal medium is formed by only two optical eigenmodes. The wedge-type liquid crystal cell can control the position of the laser spot on the screen. The incident-angle modulation of laser light is also effective for noise reduction.
- 2011-09-25
著者
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Furue Hirokazu
Department Of Electronics And Computer Science Faculty Of Science And Engineering Science University
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Koizumi Yukio
Funai Electric Advanced Technology Research Institute, Tsukuba, Ibaraki 305-0047, Japan
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Ono Masatoshi
Funai Electric Advanced Applied Technology Research Institute Inc., Kawasaki 210-0855, Japan
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Ono Masatoshi
Funai Electric Advanced Technology Research Institute, Tsukuba, Ibaraki 305-0047, Japan
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Terashima Atsuo
Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
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Shirao Masato
Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
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